M. Dolores Riera, Miguel G. Coussirat, Alfredo J. Guardo, Isaac Valls, and Daniel Casellas:
Simulation of hot stamping processes
Hot sheet stamping, thermomechanical forming, modeling, simulation
Hot stamping is a thermo-mechanical technique that allows to provide a metallic blank with both the desired geometry and properties in a single step, where deformation at high temperature, phase transformations and heat transfer occur simultaneously and affect mutually. They are several variables controlling the quality of the final component and their relationships are, in some cases, complex. Therefore, a methodology capable of taking into account all the phenomena involved is necessary in order to understand the influence of the parameters characterising the deformation system. In this work, numerical simulation techniques are implemented as a tool to evaluate the effect of different process parameters during hot stamping of boron steel, with special emphasis on thermal conductivity of the material of the dies, the cooling system of the tooling and the main features of the contact between metallic blank and tools. A very simple experimental test has proven very useful for the validation of the simulation and for adjustment of the thermal contact conductance, responsible up to a point for the cooling velocity of the sheet.
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